I've had my betta fish Martin for a few months, he was fairly little when I got him and has grown into a nice size. I use spring water and water treatment. His tank sits at 75 degrees. I feed him 3 Aqueon pellets a day.
My question is a few days ago he started acting funny. We started noticing him face down in the corner of the tank.. but then would act totally normal after that, eating like a pig and swimming around. I've also seen him up at the top in the back of the tank not really moving, but if I go up to the tank, he'll swim out to see me.
He has no lesions or changing colors in his fins. There's no sign of fin rot and his belly is not swollen that I can notice.
Is this behavior normal, or is it a sign of something going wrong?
Thanks so much!